Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fde573e755e64e0…

MALICIOUS

PDF

76.4 KB Created: 2021-10-11 00:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4f53fe145bebee1b29e5f7962bce506d SHA-1: 964729a556293a119c1ac8a5e94e52fbdfc27412 SHA-256: 7fde573e755e64e01b0d489d553d3c193a62781f11abb29e456e07f6590799e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, with numerous embedded URLs pointing to various domains, likely to obscure the final malicious destination. The presence of external URIs and the link farm characteristic strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f2c58b5abb79bcdc11d091f3c00ee60d/49293379813.pdf In PDF document text
    • http://1111.morefriendship.com/upload/files/97154114089.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/82483608266.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/83930250565.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/dimupitu.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/78421714320.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/ririrawalu.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/juxitik.pdfIn PDF document text
    • http://ymmicro.com/files/files/mebemomapakuramenajat.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210926225704.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/6580264358.pdfIn PDF document text
    • http://czyxchem.com/upload/files/povewiso.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/6171129933.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/63368142822.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/49337018003.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/36680730819.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/powazeniriwif.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f3312dac9---davojojolixawexufijexajo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/73819599522.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/81196623682.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/jiwanimumedewobemez.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/zusovasevulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+way+to+move+to+canada+from+usPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 17592 bytes
SHA-256: faf5ec2a3b63071c9c0e8e4c0f40e60941cc572d7cef7e56f1ebe63848f8078f
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10920 bytes
SHA-256: 355cfa054f481f2748bc6a85f7f513073faa0a2e2241a50511e3df1ed039855c
font_02_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1